Reciprocating follower This will form the base for the cam. cam profile. 24.2. Measure the base circle of the cam, and plot the base circle on the graph paper. Begin by drawing a straight line segment with arrows at both ends to represent the rotation of the cam. N Draw a third curved line connecting the two lines in the middle. 6 This represents the collar of the cam. 1 Set out the cylinder blank and the end elevation as shown. 0-180, follower rises 30 mm with simple harmonic motion. cam. K Examples of follower configurations used with a slot or barrel-type cam are roller, slot, or disk followers. Use a 3D printer or CNC machine to fabricate the cam profile from your CAD model. This line should be horizontal and represent the outer edge of the cam profile. Determine the size and type of roller that you need for the cam. 0-90, follower rises 20 mm with uniform velocity. The cam profile will be discontinuous. by modifying the motion. Adjust the gages scale to match the scale on the cam profile. The axis of the roller and the cam fall on the same vertical line. One basic rule in cam design is that this motion curve must be continuous and the first and second derivatives (corresponding to the velocity and acceleration of the follower) must be finite even at the transition points. Shade in the cam to give it a three-dimensional appearance. B the cam. The minimum radius of the cam is 25 mm. Above f (6) Draw the cam profile for following conditions: Follower type = knife edged follower, in line; lift = 30mm; base circle radius = 20mm; out stroke with uniform velocity in 1200 of cam rotation; dwell for 600; return stroke with uniform velocity, during 900 of cam rotation; dwell for the remaining period. Include the shaft size, length, and diameter. constant velocity motion is therefore only of theoretical movement Transfer points a,b,c..l from displacement diagram. Add any other desired features to the graph such as grid lines or a trend line. decreases at a uniform rate during the second half of the motion. 2, Do not sell or share my personal information. E F acceleration during outstroke =, armax = Max. igures are examples of this type. The tangents represent the face of the flat follower in each position. C 1. TRACE POINT, curve : The path Draw two arms extending out from the body. Secure the bearing in place with a nut and screw. Attach the clock's drive shaft to the cam followers. Initial Phase: At zero degrees of cam rotation angle, the follower is at its lowest point. The uniform-retardation parabola is constructed in a similar manner, but in the reverse position. b) Offset follower. e). These will be the cuffs. To keep the valve closed during rest of the revolution i.e. Draw two curving lines from the center of the cuffs to each corner of the rectangle. wer located at the knife-edge, roller ce 90-150, follower rises 30 mm with simple harmonic motion. Without external down ward force. Place the gage to measure the cam profile. (10) Draw the cam profile for following conditions: Follower type = roller follower, in line; roller dia. Label each interval with the appropriate speed/velocity value. Using the starting point of the vertical line, draw a curve that follows the displacement of the mass. y cam. increases at a uniform rate during the first half of the motion and In the previous cases, a spring or some resistance is required to keep the follower in contact with the cam profile at all times. between them is a combination of a relative turning motion and a is the motion during which the follower is at rest; and return machinery in which automatic control and accurate timing are Determine the number of divisions or increments needed for the cam. the inverted mechanism, turn the follower around the center of the cam So can be calculated from equation. This marks the beginning of the cam profile. Although the axis of the follower and the face are at 90 in this example, other angles are in common use. est circle from the cam as a guide). KOM - Unit 4 - Question Bank - R. Syam Sudhakar Rao is the motion of the follower away from the cam center, dwell Finally, draw a straight line from the end of the first line to the center line to complete the cam profile. The peak of the curves should be at the center of the cam shaft, with each side gradually falling off in height. cam as shown in S = 2 r point is P on the cam profile. SHM cam profile | Simple Harmonic Motion cam profile | Uniform The weight of the follower system is sufficient to maintain contact. Angular velocity () is the speed of the c were found in Leonardo da Underneath the front elevation, draw a development of the cylindrical cam surface, and on this surface draw the cam graph. from the axis of the cam shaft. This will be the base line for the performance curve. J K PDF Displacement, Velocity and Acceleration Diagrams when the Follower ASTM E 209 compression test at elevated temprature with conventional and r Highlighted Chapter 13 Nuclear Energy.pptx, McDonell Douglas T-45C Goshawk Flight Manual.pdf, McDonell Douglas F-4 Phantom FG Mk 1 Aircrew Manual.pdf, McDonell Douglas F-4G Wild Weasel Flight Manual.pdf. the axis of cam shaft By: Create a smooth line connecting all the points to show a continuous line representing the cams displacement. Start with the base circle, and plot the intersecting circles at various points around the circumference, with each point corresponding to the angle calculated in step Connect the points with a smooth profile. Draw a horizontal line from the center of the base circle to the center of the lift angle. Connect the two axes with a line, which represents the profile of the plate follower. This curve must be symmetrical about the equilibrium point, and should increase and decrease in a regular, sinusoidal pattern. 2 Draw the base circle as before. follower contacts the point of intersection (B) of the base Draw arrows in the direction of the motion at each interval. owards the cam centre. By rotating the cams in the Leonardo found cam G Plot the track on the surface of the cylinder by projecting the sides of the track in the plan view up to the front elevation.

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